What is equal to x power square

Twice the sum of a number and 4 is equal to three times the difference of the number and 7. find the number.

The dolphins at the webster are fed 1/2 of a bucket of fish each day the sea otters are fed 1/2 as much fish as the dolphins how many buckets of fish are the sea fed each day? simplify you answer and write it as a proper fraction or as a whole or mixed number

Through non-collinear points there is exactly one plane.